If you have samples of 0.5 moles of water, 36 g of water, and 3.011 x 10²³ molecules of water, which sample has the greatest mass?

Which of the following contains the largest number of water molecules?

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is:

What mass of AgCl is precipitated when 25 mL of a 8.45% $\AgNO_3$ solution is mixed with 50 mL of a 5.8% NaCl solution?

The isoelectronic species among the following are:$I){\rm{CH}}_3^ + ;{\rm{II)NH}}_2^ + ;{\rm{III)NH}}_4^ + ;{\rm{IV)N}}{{\rm{H}}_3}$

If Avogadro number, $N_A$, is changed from $6.022 imes 10^{23} \, mol^{-1}$ to $6.022 imes 10^{20} \, mol^{-1}$, this would change:

Which of the following has the maximum number of atoms?

The molar mass of oxygen atoms is 16 g/mol. What is the mass of 0.25 moles of oxygen atoms?

The volume of ammonia obtained by the complete combination of $10\,\,{\rm{mL}}$ of ${{\rm{N}}_2}$ and $30\,\,{\rm{mL}}$ of ${{\rm{H}}_2}$ is:

Which of the following pair of gases contain the same number of molecules?

Equal masses of oxygen and ozone are present in a container at 298 K. The ratio of their partial pressures ($P_{O_2} : P_{O_3}$) is: